Drop doesn't seem to work in drag & drop

When I use the dragAndDrop method of the WebDriver module the WebDriverButtonReleaseAction does not seem to run. The drag starts (WebDriverClickAndHoldAction), so the object I want to d&d is floating but the drop never happens, thus my test fails. Interestingly the dashed border appears around the drop zone, so the selenium can find it.

Environment:
- Ubuntu 14.04 (Linux 3.13.0-71-generic amd64)
- Firefox 42.0
- PHP 5.6.14-1+deb.sury.org~trusty+1
- Selenium v2.46.0. (Built from revision 87c69e2)
- Codeception v2.1.4

Start at the WebDriver module's dragAndDrop entry point and trace WebDriverClickAndHoldAction through WebDriverButtonReleaseAction while reproducing with the environment listed in the issue. Confirm that the drop action executes and the object reaches the drop zone, then add or update coverage for this behavior if the repository has relevant tests.

由索引模型根据 Issue 内容生成。